The Infrared Light Source of Touch Screen Technology

Last article, we have a rough introduction about multi-point touch screen technology, there are three points that we have to talk. The first aspect is infrared.
In the multi-touch technology, the main role of the infrared light source is the difference between the touch surfaces of the visual interface and a finger or object traces. Many systems use a projector or monitor as a display of equipment, how to make the camera only to read the finger or an object feedback is that we need to focus, and modified the camera so that it only reads what we touch in the surface and feedback the touch point which we need.
The majority of acrylic (Acrylic) manufacturer in the production of acrylic has strengthened the ability to undermine the infrared above 900nm, this can help to reduce the absorption of solar heat when used as the window. Many cameras amend to reduce the interference of 940nm infrared sensitivity and reduce sunlight.
The infrared light is through the infrared light-emitting diodes. Based on the optical principle of multi-touch technology (especially the LED-LP as well as by FTIR), infrared light-emitting diodes can be used as an effective infrared light source to improve the infrared light that we need. Scattered light multi-point touch technology (DI) is not necessarily to the infrared light emitting diode, but also can install the infrared light-emitting diode infrared light source group. The multi-touch technology of the Laser Plane (LLP) uses the infrared laser as an infrared light source.
Under normal circumstances, you can purchase a single infrared light emitting diode, or buy infrared light-emitting diodes.
Single infrared light emitting diode: the price of a single infrared light emitting diode is relative inexpensive, can make use of FTIR, DSI easily, as well as LED-LP technology, equipment, production of light-emitting diode box, but we need to understand how to welding circuit. The most commonly used model is the Osram SFH 485P, if you want to use the LCD panel as the display devices, then you need greater brightness infrared light – emitting diodes.
Infrared light emitting diodes with: This is the bands of infrared light-emitting patch production, combined with flexible flat cable, which is very convenient. It has been assembled after we purchase, we need only attached to the acrylic four sides. The best infrared light-emitting diodes fromUnited Statesare recognized as the best quality.
Infrared transmitter: for the scattering of light multi-touch device, the device of this approach is simpler, we only need to illuminate the box through infrared transmitter, but we need to note is how to eliminate the problem of area is too bright.
Before we purchase the infrared light-emitting diodes, we need to pay great attention to the parameter list of the light-emitting diode, wavelength, angle, power, etc., these are the focus. After we have a comprehensive understanding about infrared infrared light source, we will have a full use of our touch screen.